The actual duties and qualifications determine the fit; preparation cost does not alter the requirements.
Budget after identifying the real case
Understand the professional scope and necessary evidence. A less expensive document package is not useful if it describes a profession the actual engagement does not support.
Treat the budget as an evidence plan, not as a way to select the cheapest category. List government charges, travel, translations, credential evaluation where genuinely needed, licensing costs, and the cost of obtaining reliable employer records. Then identify which expenses solve a legal question. Paying for a polished résumé does not establish a listed profession; paying for a required licence may be necessary but still does not show that the duties fit. The first review should also distinguish an employer’s commercial expenses from the applicant’s immigration expenses, because an invoice from one does not prove the other. Do not spend on a filing sequence until the employer’s description, remuneration, and duration have been settled. Citizenship of Canada or Mexico, plus a genuine professional engagement are threshold conditions, and TN is unavailable where the arrangement is substantively a sole-controlled US business. Hypothetical example: a soil scientist is offered a six-month remediation project and is considering an expensive credential package. The decisive record is the employer’s signed scope identifying soil analysis and the degree requirement, plus her degree and any licence demanded by the state. If those documents show the wrong profession, extra translations will not cure it. If they fit, the budget can be limited to evidence that actually establishes the claim.